Azo dye.



UNITED STATES rannr crates.

AUGUST BLANK AND KARL HEUSNEB, 0F LEVERKUSEN, NEAR COLOGNE, GERMANY, ASSIGNORS T0 FAIR-BENFABRIKEN VORM. FRIEDB. BAYER & (10., 0F ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

AZO DYEI No Drawing.

which can be obtained by combining the tetrazo compounds from para-phenylenediamin azo beta aininoalpha naphthol betasulfonlc ac1 ds p v Z(beta)N-N-Cl ,1-.\=u 1 c,n. 4 n-N.omm -(clpha)OH (beta)SO3Na in any order of succession with one molecule of a 1.8-aminonaphthol-sulfonic acid in acid solution and with one molecule of an azo dycstuit' component, especially resorcin, a meta-diamin, or a meta-aminophenol.

The new dyes are in the shape of their alkaline salts dark powders which are soluble in water generally with a blue color and which are soluble in concentrated sulfuric acid with from a greenish-blue to dark blue color. They dye cotton from blue to black shades. lVhen on fiber they can be combined with diazo compounds.- Generally black shades fast to light are thus obtained. These shades can be discharged to a pure white.

150 parts of para-aminoacetanilid are diazotized and introduced at 0 G. into a solutibn of 207 parts of sodium carbonate and 261 parts of sodium salt of Q-amino-S-naphthol-7-sulfonic acid. The combination is complete after a short time. In order to eliminate the acetyl group 2500 parts of caustic soda lye (30 per cent.) are added to the mixture which is heated to boiling for some time. The saponified c'ompound is then tetrazolized in the usual way by acidu lating, adding 300 partsof HCl (195 Be'.) and 138 parts of sodium nitrite and the resulting tetrazo compound is then at first combined in acid solution with 363 parts of the sodium salt of 1-.8-aminonaphthol4.(5- disult'onic acid. After some hours the free mineral acid is neutralized with sodium acetate. The intermediate compound is then Specification of Letters Patent,

vPatexcited slept. 5,. 12 1%).

Application filed December 17,1909. Serial No. 533,701.

introduced into a cooled solution of 110 parts of resorcin and 1035 parts of sodium carbonate in water. The combination is complete after a short time. The new dye is salted out, filtered oft and dried.

The new dye is in the shape of its sodium salt a dark powder which is soluble in water with a blue color. It dyes cotton. blue shades. by treating in the usual way the dyed goods with diazotized para-nitranilin a black is obtained which fast to light and which can be discharged to a pure white with hydrosulfites. By reduction with stannous chlorid and hydrochloric acid the. dye is split up. Paraphenylenediamin, 2.6-diamino-5-na.phthol-l-sultonic acid, aminoresorcin and 1.2-diamino-8-naphtholstidisultonic acid are thus obtained.

The process for the manufacture of the dyestufi's is carried out in an analogous manher on using other of the above mentioned components a. g. instead of 2.5.7-aminonaphthol sult'onic acid the 2.8.G-aminonaphthol sult'onic acid can be used, instead of 1.S.4.(S-aminonaphthol sulfonic acid the 1.8%, '1.S.5-aminomtphthol sulfonic acid or 1.8.3.6-aminonaphthol disulfonic acid, and instead of resorcin meta--aminophenol, ineta-phenylene-diainin or their derivatives may be used.

We claim 1. The herein. described azo-dyestuls obtainable from the above defined tetrazo compounds, which dyestulls arein the shape of their alkaline sav ts dark powders soluble in water generally with a blue color, soluble in concentrated sulfuric acid with from a greenish-blue to dark blue color: dyeing cot.-

tou from blue to black shades, which can be developed on fiber with diam generally black shades fast to l obtained which can be 7 white, substantially as described.

2. The herein described azo dyestult obtainable from para-aminmicetanilid, 2.5.7- aminonaphthol sulionic acid. 1.8.4.6-aminonaphthol disulttonic acid and resorcin, which is in the shape of its sodium salt a dark powder soluble in water with a blue color, dyeing cotton blue shades, which can be combined with diazotized para-nitranilin black shades fast to light being obtained,

charged to a pure yielciing' upon refluction with stannous scribing Witnesses.

e d a 11:1 hydlfuehlorie avid para-phenyl- T IT e enuiixunin, lii-diznnino naphthol 7 sulg fi igi mic acid aminoresorcln and 1.2.-dimnin0- 31ephthel-eLfi-dlsuii'ome aeld, substantmlly- WItHQSSGS as d EClibCd. OTTO KGNJG,

1 11 iesthnony whereof We have hereunto CHAS. J. WRIGHT.

' 2) can be discharged to a pure white set our hands in the presence of two sub- 

